1. Facebook Messenger：
Facebook Messenger是由Facebook开发的美国消息收发应用程序和平台。它允许用户发送消息，交换照片，视频，贴纸，音频和文件，对其他用户的消息做出反应并与漫游器进行交互，支持语音和视频通话。
2.电报信使：
电报是基于云的即时消息传递和IP语音服务。它允许用户发送消息并交换照片，视频，贴纸，音频和任何类型的文件。
Facebook Messenger和Telegram Messenger之间的区别：
| Facebook Messenger | Telegram Messenger |
|---|---|
| It is owned by Facebook, Inc. | It is also owned by Telegram Messenger LLP. |
| It was launched on 9th Aug 2011. | It was launched in 14th Aug 2013. |
| Facebook Messenger has a facebook sign in option. | Telegram Messenger does not have a facebook sign in option. |
| In Facebook Messenger you can do group video chat. | There is no such option in Telegram Messenger. |
| In Facebook Messenger You can export app data to an email address, so you have a backup and can forward it to another person if needed. | Telegram Messenger does not allow this. |
| In Facebook Messenger you can do group voice chat. | There is no such option in Telegram Messenger. |
| In Facebook Messenger anyone can send message to you. | In telegram you have to add or accept contacts before messaging. It prevents strangers fron sending you unwanted messages. |
| In Facebook Messenger There is no option such that an image which automatically disappears once the person has seen it. | In telegram you can send an image which can disappear once the person has seen it. |
| In Facebook Messenger you can not share your friends contact. | In Telegram Messenger there is an option to directly share your friend’s contact. |
| In Facebook Messenger you can not see when a user was last active. | In Telegram Messenger you can see when a user was last active. |